Interactions of dynamic supercritical CO2 fluid with different rank moisture-equilibrated coals: Implications for CO2 sequestration in coal seams

doi:10.1016/j.cjche.2020.10.020

Abstract

Abstract: The interactions between CO₂ and coals during CO₂-ECBM (CO₂ sequestration in deep coal seams with enhanced coal-bed methane recovery) could change pore morphology and chemistry property of coals, thereby affecting adsorption, diffusion and flow capability of CO₂ and CH₄ within coal reservoirs. To simulate CO₂-ECBM process more practically, the dynamic interactions of supercritical CO₂ (scCO₂) and moisture-equilibrated coals were performed at temperature of 318.15 K, pressure of 12.00 MPa, and duration of 12.00 h. The impacts of the interactions on physicochemical properties of coals were investigated. Results indicate that scCO₂/H₂O exposure shows minor effect on micropores of coals. However, the exposure significantly decreases the mesopore surface area of bituminous coals, while increases that of anthracites. The mesopore volume and the average mesopore diameter of all the coals after scCO₂/H₂O exposure decrease. The multi-fractal analysis verifies that the scCO₂ exposure can enhance the pore connectivity of various rank coals. Apart from the pore morphology, the exposure of scCO₂/H₂O also affects the oxygenic functional groups on coal surface. Particularly, the exposure of scCO₂/H₂O reduces the content of CO and CO of coals. The content of COOH of low rank coals including Hehua-M2# coal, Zhongqiang-4# coal, Buliangou-9# coal and Tashan-5# coal decreases, while the high rank Laochang-11# coal and Kaiyuan-9# coal witness a growth in COOH. The content of total oxygenic functional groups of all coals after interaction with scCO₂/H₂O decreases; on the contrary, that of CC/CH of all coals after scCO₂/H₂O exposure increases. In summary, the interaction with scCO₂/H₂O significantly changes the pore system and oxygenic functional groups of various rank coals, which needs further attention regarding CO₂-ECBM.

Key words: Coal, Sequestration, Moisture, Supercritical carbon dioxide, Methane

摘要： The interactions between CO₂ and coals during CO₂-ECBM (CO₂ sequestration in deep coal seams with enhanced coal-bed methane recovery) could change pore morphology and chemistry property of coals, thereby affecting adsorption, diffusion and flow capability of CO₂ and CH₄ within coal reservoirs. To simulate CO₂-ECBM process more practically, the dynamic interactions of supercritical CO₂ (scCO₂) and moisture-equilibrated coals were performed at temperature of 318.15 K, pressure of 12.00 MPa, and duration of 12.00 h. The impacts of the interactions on physicochemical properties of coals were investigated. Results indicate that scCO₂/H₂O exposure shows minor effect on micropores of coals. However, the exposure significantly decreases the mesopore surface area of bituminous coals, while increases that of anthracites. The mesopore volume and the average mesopore diameter of all the coals after scCO₂/H₂O exposure decrease. The multi-fractal analysis verifies that the scCO₂ exposure can enhance the pore connectivity of various rank coals. Apart from the pore morphology, the exposure of scCO₂/H₂O also affects the oxygenic functional groups on coal surface. Particularly, the exposure of scCO₂/H₂O reduces the content of CO and CO of coals. The content of COOH of low rank coals including Hehua-M2# coal, Zhongqiang-4# coal, Buliangou-9# coal and Tashan-5# coal decreases, while the high rank Laochang-11# coal and Kaiyuan-9# coal witness a growth in COOH. The content of total oxygenic functional groups of all coals after interaction with scCO₂/H₂O decreases; on the contrary, that of CC/CH of all coals after scCO₂/H₂O exposure increases. In summary, the interaction with scCO₂/H₂O significantly changes the pore system and oxygenic functional groups of various rank coals, which needs further attention regarding CO₂-ECBM.

关键词: Coal, Sequestration, Moisture, Supercritical carbon dioxide, Methane

Zichao Hu, Chao Li, Dengfeng Zhang. Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams[J]. Chinese Journal of Chemical Engineering, 2021, 35(7): 288-301.

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Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams

Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams

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